Photocatalysis is based on absorption of light and consequent production of oxidizing and reducing
species both on the semiconductor and in the surrounding medium capable of partly or wholly
mineralising the majority of organic compounds. The oxidation state of inorganic compounds could be
changed as well.
Its principle is based on the simultaneous action of photons and of a catalytic layer which allows to
destroy the molecules. The most commonly used photocatalyst is titanium dioxide (TiO2), which is
thermodynamically stable, non toxic and economical. It can be used in powder form in water or deposited
on a substrate (glass fibre, fabrics, plates/sheets,…).
Photocatalysis applications in the following sectors:
- Air purification
- Water purification
- Self cleaning application (surfaces: glass, metals, concretes, cements, plastics, ceramics, textils,
paints and varnishes, etc.).
Definition from CEN/TC386 meeting in Milano 06,10,2010
